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It is almost the same as DELL monitor (BenQ makes monitors for Dell and HP), so look for shorted transistors, cold solder joint, fuse. If you are going to DIY and have proper tools and know safety precaution then please read on: Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed DELL monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further and it will help out other people in the future also. http://en.wikipedia.org/wiki/Capacitor_plague Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Those models are made by BenQ. Their notariety is bad solder connections that cause the drive transistors to overheat. Sometimes it just blows fuse pf751(2 amp); other times it will damage a transistor or two (2sc5707 or 5706 x 4).
Be sure to resolder the output transformer leads.
If you are referring to the C5707 inverter driver transistors, you can test them in circuit with an ohmmeter. Usually one pair will show shorted although only one may be actually shorted. Normal procedure is to replace the pair that shows in circuit short. If you do not resolder the transformer connections your transistors will short again. Monitor Mike
Is there a diode on the other side of the transistor? That could have gone as well (if my electronics repair hasn't failed me yet!!) That is just a stab in the dark. Sorry I couldn't be more help, but it has been quite a few years (15 at least!).
You have BenQ syndrome.
Sounds strange I know, but the power supply in your monitor is a BenQ manufactured part.
The problem is in the inverter section of the power/inverter board.
There are 4 small transistors (marked C5707) 1 or possibly 2 of these will have shorted out. Using a multimeter find the shorted one, and replace both of that pair, even if only one is shorted out.
There could also be other underlying issues as well that caused the transistor to fail in the first place.
Resolder the power transistors on inverter board and also check them.If display is not there at all some of this 4 transistors C5707 should be defective.Check associated fuse and Fet which drives the transistor.
Also check with Benq ,Normally offers three year warranty.
There is a Switch transistor to power on -off the hi voltaje for lights. Check 15V from power source go to this transistor colector, Using soldering Iron, make a juntion between colector and emiter, to short 15V to Hi voltaje power. I´m fixing 10 monitor the same trouble. I will remove a liter transistor.
Late I will post here the driver transistor number, and the replace number transistor I will use.
Pictures , etc. Best Regard